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Lessons (4)

• Two Pointers & Sliding Window

  … To see the next group, you don't rebuild the window; you slide it: one carriage leaves on …

• DSA Interview Patterns Cheat Sheet

  … Contiguous subarray<br/ or substring?} B -- yes SW[Sliding window / Prefix sums] B -- no C{Tree or graph …

• Scaling, Load Balancing & Rate Limiting

  … Fixed window Count per minute (resets at :00) Simple; allows 2× bursts at window edges Sliding window Count …

• Stacks & Queues

  … Deque (double-ended) Add/remove at both ends Sliding window maximum Priority queue Highest priority out first ER …